cortx
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Cooling the pi

Fri Jul 19, 2013 5:19 pm

Hello;

I want to cooling my pi and I buy one heat sink
http://www.amazon.fr/dissipateur-thermi ... =raspberry
But some people said that the system to glue the heat sink is not so good.
So I decide to not use it but I want to cool my pi.

I've some other heat sink from a graphic card system cooling (accelero Xtreme 3) that fit perfectly.
Image
I don't know if I glue this with only thermal paste or if I use thermal glue that was given with my graphic card cooling.
And I don't know where to fix them.
Should I use 3 heat sink or 2 heat sink ?
2 - Image
3 - Image
The difference is about the Voltage Regulator.

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solar3000
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Re: Cooling the pi

Fri Jul 19, 2013 5:38 pm

You don't really need a heat sink. Just provide some air space.
Hope this isn't just a spam post.
Last edited by solar3000 on Fri Jul 19, 2013 6:16 pm, edited 2 times in total.
Antikythera

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Re: Cooling the pi

Fri Jul 19, 2013 5:44 pm

Go away.

So that anyone stumbling here can be sure - the Pi does not need any heat sinks.
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jackokring
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Re: Cooling the pi

Fri Jul 19, 2013 5:54 pm

Need vs. want vs. howto as a free form can do. It's a form of moding. I wont do it as there be other glitter wanting gold, but fair enough.
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rpdom
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Re: Cooling the pi

Fri Jul 19, 2013 6:44 pm

Heatsinks on a Pi are like putting "Go faster stripes" on your car. They may look nice, but they don't do anything useful.

cortx
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Re: Cooling the pi

Fri Jul 19, 2013 8:37 pm

Ok thanks for those replies.

I think if temp are lower I could upgrade the frequency of the proc.

But if it's not needed; that's cool :D

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Re: Cooling the pi

Fri Jul 19, 2013 9:03 pm

Funny that people think reducing the temperature will make it faster

Actually the opposite is true...


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jamesh
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Re: Cooling the pi

Fri Jul 19, 2013 9:10 pm

gsh wrote:Funny that people think reducing the temperature will make it faster

Actually the opposite is true...


Gordon
As I understand it, as the CPU core gets hotter, the little pixies inside that carry the data around (I think they use rucksacs) run around faster so they don't hurt their feet on the hot silicon. Or something like that.
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Re: Cooling the pi

Fri Jul 19, 2013 9:24 pm

As heat goes up conductivity goes up, and singular electron mobility goes down. (thinks ...), semiconductors are insulators at 0 K. Often it's the routing, and density which are most critical, with undersize super buffers and high fan outs. A buries n+ layer can speed things, as can an antiphase bottom gate with output feedback and a non exceeded Vthreshold. The resulting non conduction of the bottom channel is good! (as desired for operation), but the displacement of space charge can cancel quite a bit of the Miller effect. To thick the insulation, or to increase carrier density?
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Jim Manley
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Re: Cooling the pi

Fri Jul 19, 2013 9:45 pm

jackokring wrote:semiconductors are insulators at 0 K.
To be perfectly technical, EVERYTHING is an insulator at 0 K (absolute zero for neophytes who don't know what the Kelvin scale is) since, by definition, all motion ceases, including that of electrons. People confuse superconducting NEAR absolute zero as occurring AT absolute zero, but there's a universe of difference as absolute zero exists nowhere, even in intergalactic space where the occasional barely-vibrating hydrogen atom can be bumped into every so many (thousands of?) kilometers.
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Re: Cooling the pi

Sat Jul 20, 2013 12:03 am

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solar3000
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Re: Cooling the pi

Sat Jul 20, 2013 3:34 am

gsh wrote:Funny that people think reducing the temperature will make it faster

Actually the opposite is true...


Gordon

really?
I'm putting mine in the oven!
I'll let you know how it goes ok?
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Re: Cooling the pi

Sat Jul 20, 2013 8:39 am

solar3000 wrote:
gsh wrote:Funny that people think reducing the temperature will make it faster

Actually the opposite is true...


Gordon

really?
I'm putting mine in the oven!
I'll let you know how it goes ok?
Yes, you do that!
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Re: Cooling the pi

Sat Jul 20, 2013 4:54 pm

I did that once. The pi ran like normal but the oven started to stink when the insulation on the power cord melted intothe hheating element.

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solar3000
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Re: Cooling the pi

Sat Jul 20, 2013 11:01 pm

jamesh wrote:
solar3000 wrote:
gsh wrote:Funny that people think reducing the temperature will make it faster

Actually the opposite is true...


Gordon

really?
I'm putting mine in the oven!
I'll let you know how it goes ok?
Yes, you do that!

It didn't work.
In fact the rpi board disappeared.
All I found was some splatter of copper and a drop of lead.
Antikythera

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nerd7473
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Re: Cooling the pi

Sat Jul 20, 2013 11:41 pm

If you overclock it, that could make it heat up so you may want to use something like a fan or heat sinks to aid in cooling the pi just my thought though.
nerd7473

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mahjongg
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Re: Cooling the pi

Sun Jul 21, 2013 12:55 am

no! even over clocked to the max the PI doesn't need cooling. its not the temperature that is troublesome with extreme over clocking, but rather the increase of the core voltage, that is needed to make the transistors in the chip go even faster, which may "blow" a transistor in the SoC.

And as was attempted to explain above cooling doesn't increase the capability to be over-clocked at all, :!: quite the opposite!

Cooling fans, as used on PC video cards are only used because the massive amount of heat dissipated by these card (hundreds of times more than the GPU in the PI's SoC dissipates) would otherwise heat them up so much that the lifetime endurance of the silicon chips used in them would be endangered, by temperatures far in excess of the 85 degrees Celcius that is deemed still acceptable for silicon.

the only remotely "sensible" use for heat-sinks on the PI is simply that they may be used as "bling".

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Jessie
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Re: Cooling the pi

Sun Jul 21, 2013 4:20 am

I only cool mine with liquid nitrogen or liquid helium.

I swear one of these days I'm going to mill a intel heatsink and glue it to my Pi I really don't want it to overheat.

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Scooby2
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Re: Cooling the pi

Mon Oct 28, 2013 1:47 pm

I'm lucky enough to live in the country and we have a stream running alongside our house. When Summer comes and my Pi risks getting too hot I simply pop it in the stream. No heatsinks, fans or power. How ecological and environmentally friendly is that? :mrgreen:
Please excuse me, I need to go for a Pi....

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nerd7473
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Re: Cooling the pi

Wed Mar 05, 2014 3:24 pm

My pi freezes sometimes when it gets warm... Around 33-40 degrees C that is why I have need using a fan.
nerd7473

plugwash
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Re: Cooling the pi

Thu Mar 06, 2014 5:54 am

jackokring wrote:As heat goes up conductivity goes up
The conductivity of an undoped semiconductor is largely dependent on temperature with a higher temperature meaning more carriers.

With a doped semiconductor however the picture is more complex, at very low temperatures it will be an insulator, then as the temperature rises the electrons and holes will "boil off" the dopants. Then you will get a region where the conductivity is fairly stable (and even falls slightly with temperature), then eventually as the temperature gets high enough the dopants become irrelevent and it starts behaving like an undoped semiconductor.

And with semicondutor devices the picture gets even more complex, an increase in temperature means an increase in "minority carriers", an increase in minority carriers means your diodes and transistors get leakier and in general you don't want your devices to be leaky.

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rpdom
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Re: Cooling the pi

Thu Mar 06, 2014 8:00 am

plugwash wrote:And with semicondutor devices the picture gets even more complex, an increase in temperature means an increase in "minority carriers", an increase in minority carriers means your diodes and transistors get leakier and in general you don't want your devices to be leaky.
So we don't need heatsinks, but we do need a drip tray to catch the leaks? :lol:

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bob_binz
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Re: Cooling the pi

Thu Mar 06, 2014 9:02 am

plugwash wrote:
jackokring wrote:As heat goes up conductivity goes up
The conductivity of an undoped semiconductor is largely dependent on temperature with a higher temperature meaning more carriers.

With a doped semiconductor however the picture is more complex, at very low temperatures it will be an insulator, then as the temperature rises the electrons and holes will "boil off" the dopants. Then you will get a region where the conductivity is fairly stable (and even falls slightly with temperature), then eventually as the temperature gets high enough the dopants become irrelevent and it starts behaving like an undoped semiconductor.

And with semicondutor devices the picture gets even more complex, an increase in temperature means an increase in "minority carriers", an increase in minority carriers means your diodes and transistors get leakier and in general you don't want your devices to be leaky.
You're not the Peter Green that worked at Philips are you?

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Re: Cooling the pi

Thu Mar 06, 2014 1:47 pm

No i'm not

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Re: Cooling the pi

Thu Mar 06, 2014 1:59 pm

cortx wrote:I think if temp are lower I could upgrade the frequency of the proc.
You could run at higher clock speeds for the same operating temperature if that's what you mean. It's almost definitely not necessary though. :)
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